The mayor’s job approval rating has tumbled to 50%, down 10 points from the university’s last poll on May 17. (Susan Watts/New York Daily News)

It's not just the Summer of Hell for commuters — Mayor de Blasio is also feeling the heat, according to a new poll from Quinnipiac University.

The mayor's job approval rating has tumbled to 50%, down 10 points from the university's last poll on May 17, according to the survey released Monday. And just 46% of voters say he deserves re-election — down from 57% who wanted to give him another shot back in May.

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The mayor's slump coincides with a subway crisis and comes as de Blasio has repeatedly sought to emphasize that Gov. Cuomo runs the MTA, a state agency. A poll from the university last week found 40% of voters do blame Cuomo for the subways — but 21% say de Blasio is to blame, and 20% put both on the hook. Of voters surveyed, 41% thought the pair is locked in a "personal feud."

"Leave out the one big question — the reelection match-up — and this is a pretty bad poll for Mayor Bill de Blasio," Maurice Carroll, assistant director of the Quinnipiac University Poll, said in a statement.

De Blasio can indeed find solace in that one big question — the poll found he's still outpacing his competitors in the race for City Hall.

In a head-to-head match-up with Assemblywoman Nicole Malliotakis, the presumptive Republican nominee, de Blasio wins with 57% of the vote to Malliotakis' 22%, the poll found. It's a slip for de Blasio, who in May won the match-up 62 to 21%, but still a massive margin.

The mayor has repeatedly tried to emphasize that Gov. Cuomo is in charge of the struggling MTA. (Susan Watts/New York Daily News)

Add in Bo Dietl running as an independent, and the news stays good for the mayor but gets worse for Malliotakis.

In a three-way race, de Blasio takes 52% of the vote, Malliotakis garners 15% and Dietl draws 11%, according to the poll.

There could still be time for both candidates challenging the mayor to change the minds of voters: 78% of those polled said they don't know enough about Malliotakis to form an opinion, and 74% said the same for Dietl.

"Polls go up and polls go down," de Blasio spokesman Dan Levitan said. "Our campaign is about the Mayor's record and vision for the future, and we are going to remind New Yorkers that under Bill de Blasio, crime is at record lows, graduation rates and test scores are at record highs, and under this Mayor tenants have been protected and the first two rent freezes in history have been passed."

De Blasio has sought to tie Malliotakis to President Trump, for whom she voted in November — and whose presidency 79% of New Yorkers disapprove of, according to the poll.

In a head-to-head match-up with Assemblywoman Nicole Malliotakis (pictured), the presumptive GOP nominee, de Blasio wins with 57% of the vote to Malliotakis’ 22%. (Bebeto Matthews/AP)

Trump's numbers are the lowest net approval rating for any president in any state or national poll Quinnipiac has conducted in more than 20 years, according to the university.

"Numbers aren't set in stone and Bo is gaining traction with voters," said Bruce Lynn, a Dietl spokesman. "It's still early in the race,"

The Malliotakis campaign said the poll shows a clear dissatisfaction with de Blasio.

"As we grow closer to Election Day, New Yorkers will realize that that this is a race between Mayor 'I don't care' de Blasio on the Democratic line and Assemblywoman Nicole Malliotakis on the Republican line," Malliotakis spokesman Rob Ryan said. "What this poll shows is a majority of New Yorkers don't like Mayor 'I don't care' de Blasio's handling of public schools, the homeless crisis, corruption and the city budget. With common sense solutions, Nicole Malliotakis is clearly the only candidate who can defeat a mayor who simply doesn't care in November"